Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
49.5
52
68
41
45
51
February
60.1
61
64
58
50
65
March
81.2
90
80
78
79
92
April
91.2
89
88
91
99
May
96.2
98
98
98
93
June
97.0
93
98
97
98
July
95.6
97
96
100
96
August
98.2
98
99
98
98
September
95.0
99
83
94
100
October
83.4
76
82
94
90
November
61.5
59
41
65
53
December
40.9
50
48
39
49
Average
81.5
69.7
84.5
81.3
83.7
86.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.